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Random otto deaths

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I introduced 3 ottos to my 20 gallon after two weeks in QT last Friday. This morning I found one of them dead in the filter intake. My water parameters are 0 ammonia and nitrite and 5 to 10 nitrates with a ph of 7.8. Is this just a case of random death? I had plenty of algae in the tank before I put them in and didn't notice any of them being skinny they all appeared to be healthy.

I had several otos do this me as well. No discernible reason, just up and croaked. They are sensitive; so much so that we can't always identify what they're sensitive to - they just die. They say this will often happen within the first month. I found it happened slowly over several months.

Its ok I've read the same thing over and over I just thought things were going really well. I'll see how the others do and replace the 3rd in a few months. The tank has only had fish for 2 months now so maybe it just needed more time to mature.